If you have upgraded from Windows RT, Windows 8, or Windows Server 2012 to Windows RT 8.1, Windows 8.1, or Windows Server 2012 R2 and you encounter one of these issues, you have to use one of the workarounds in the "Resolution" section in KB 2909960. For more information about the workarounds in the "Resolution" section in KB 2909960, click the following article number to view the article in the Microsoft Knowledge Base:

If you have not upgraded to Windows RT 8.1, Windows 8.1, or Windows Server 2012 R2, upgrade the computer by using a Windows image that contains update 2919355 that was released on April 8, 2014. For more information this update rollup package, click the following article number to view the article in the Microsoft Knowledge Base: